CN112631379A - Cover plate assembling method and electronic equipment - Google Patents
Cover plate assembling method and electronic equipment Download PDFInfo
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- CN112631379A CN112631379A CN202110014242.6A CN202110014242A CN112631379A CN 112631379 A CN112631379 A CN 112631379A CN 202110014242 A CN202110014242 A CN 202110014242A CN 112631379 A CN112631379 A CN 112631379A
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- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/10—Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
Abstract
The embodiment of the application provides a cover plate assembling method and electronic equipment, wherein the cover plate assembling method comprises the following steps: providing a middle frame and a cover plate; acquiring a first point cloud corresponding to the middle frame and a second point cloud corresponding to the cover plate, and drawing a virtual middle frame and a virtual cover plate; assembling the virtual middle frame and the virtual cover plate based on the first point cloud and the second point cloud to obtain a first displacement between the assembling position and the original position of the virtual middle frame and a second displacement between the assembling position and the original position of the virtual cover plate; and moving the middle frame and/or the cover plate according to the first displacement and the second displacement to joint the cover plate with the middle frame. The cover plate assembling method provided by the embodiment of the application can reduce assembling errors in the assembling process of the middle frame and the cover plate and improve the assembling effect of the cover plate on the middle frame in the electronic equipment.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a cover plate assembly method and an electronic device.
Background
With the development of electronic technology, electronic devices such as smart phones and tablet computers have more and more functions, and people have stronger and stronger dependence on the electronic devices such as the smart phones and the tablet computers, so that higher and higher requirements are provided for the appearance and the functions of the electronic devices. Among them, curved surface back covers and curved surface display screens are more and more popular with people than conventional flat surface back covers and flat surface display screens. The common assembly mode that the rear cover and the display screen are assembled to the middle frame has been developed by the schemes of manual assembly, jig positioning assembly, jig centering assembly, equipment CCD assembly, equipment line laser assembly and the like, however, the assembly effect of the assembly mode on the curved cover plate is not ideal.
Disclosure of Invention
The embodiment of the application provides a cover plate assembling method and electronic equipment, which can improve the assembling effect of assembling a cover plate on a middle frame in the electronic equipment.
The embodiment of the application provides a cover plate assembling method, which comprises the following steps:
providing a middle frame and a cover plate;
acquiring a first point cloud corresponding to the middle frame and a second point cloud corresponding to the cover plate, and drawing a virtual middle frame and a virtual cover plate;
assembling the virtual middle frame and the virtual cover plate based on the first point cloud and the second point cloud to obtain a first displacement between the assembling position and the original position of the virtual middle frame and a second displacement between the assembling position and the original position of the virtual cover plate;
and moving the middle frame and/or the cover plate according to the first displacement and the second displacement to joint the cover plate with the middle frame.
The embodiment of the application also provides electronic equipment, which comprises a middle frame and a cover plate, wherein the cover plate is assembled on the middle frame by adopting the cover plate assembling method.
The cover plate assembling method includes the steps of firstly obtaining first point clouds corresponding to a middle frame and second point clouds corresponding to a cover plate, drawing a virtual middle frame and a virtual cover plate, then assembling the virtual middle frame and the virtual cover plate, obtaining first displacement of the virtual middle frame needing to move and second displacement of the virtual cover plate needing to move, and finally assembling actual middle frame and actual cover plate according to the first displacement and the second displacement, so that assembling errors in the assembling process of the middle frame and the cover plate are reduced, and the assembling effect of the cover plate assembled to the middle frame in electronic equipment is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a first flowchart illustrating a cover plate assembling method according to an embodiment of the present disclosure.
Fig. 2 is a second flowchart of a cover plate assembling method according to an embodiment of the present disclosure.
Fig. 3 is a third schematic flow chart of a cover plate assembling method according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
With the development of electronic technology, electronic devices such as smart phones and tablet computers have more and more functions, and people have stronger and stronger dependence on the electronic devices such as the smart phones and the tablet computers, so that higher and higher requirements are provided for the appearance and the functions of the electronic devices. Among them, curved surface back covers and curved surface display screens are more and more popular with people than conventional flat surface back covers and flat surface display screens. The common assembly mode that the rear cover and the display screen are assembled to the middle frame has been developed by the schemes of manual assembly, jig positioning assembly, jig centering assembly, equipment CCD assembly, equipment line laser assembly and the like, however, the assembly effect of the assembly mode on the curved cover plate is not ideal. Therefore, the embodiment of the application provides a cover plate assembling method, which improves the assembling effect of assembling a cover plate on a middle frame in an electronic device.
Referring to fig. 1, fig. 1 is a first flowchart illustrating a cover plate assembling method according to an embodiment of the present disclosure. The cover plate assembling method provided by the embodiment of the application comprises the following steps:
101, providing a middle frame and a cover plate.
The middle frame can be a structural main body of the middle frame, the middle plate or a semi-finished product assembly with the middle plate of the electronic equipment and the like for bearing the overall strength of the electronic equipment and each assembly. The middle frame is generally a flat plate structure.
The cover plate can be a rear cover of the electronic device, a screen or a transparent cover plate on the screen. The cover plate can be a plane cover plate and can also be a curved surface cover plate. Wherein, curved surface apron includes 2.5D curved surface apron and 3D curved surface apron. The 2.5D curved cover plate is a curved cover plate with a plane structure at the middle part and a curved structure at the edge part, and the 3D cover plate is a curved cover plate with a curved structure at the middle part and the edge part but the curvature of the middle part is smaller than that of the edge part.
And 102, acquiring a first point cloud corresponding to the middle frame and a second point cloud corresponding to the cover plate, and drawing a virtual middle frame and a virtual cover plate.
The point cloud is a point data set of the product appearance surface obtained by the measuring instrument. Generally, the number of points obtained by using a three-dimensional coordinate measuring machine is small, and the distance between the points is large, so that the point cloud obtained by using the three-dimensional coordinate measuring machine is called as sparse point cloud; the point cloud obtained by using the three-dimensional laser scanner or the camera scanner is called dense point cloud because the number of points obtained by using the three-dimensional laser scanner or the camera scanner is large and the distance between the points is small.
In the embodiment of the application, the three-dimensional sensor can be used for scanning the 3D curved surface shape/contour of the middle frame and the cover plate, the first point cloud corresponding to the middle frame and the second point cloud corresponding to the cover plate are obtained, the first point cloud is used for drawing the virtual middle frame, and the second point cloud is used for drawing the virtual cover plate.
It should be noted that the terms "first" and "second" in the description of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
103, assembling the virtual middle frame and the virtual cover plate based on the first point cloud and the second point cloud to obtain a first displacement between the assembling position and the original position of the virtual middle frame and a second displacement between the assembling position and the original position of the virtual cover plate.
It should be noted that "displacement" is a vector, and includes a direction and a numerical value. The first displacement comprises the moving distance and the moving direction of the virtual middle frame required to move from the original position to the assembly position, and the second displacement comprises the moving distance and the moving direction of the virtual cover plate required to move from the original position to the assembly position. The first displacement and/or the second displacement may be zero, that is, the displacement of the virtual middle frame and/or the virtual cover plate is zero.
And 104, moving the middle frame and/or the cover plate according to the first displacement and the second displacement to attach the cover plate to the middle frame.
After the first displacement and the second displacement are obtained, the middle frame and the cover plate need to be assembled in reality according to the first displacement and the second displacement. The relative position of the middle frame and the cover plate can be adjusted by adopting a high-precision six-axis motion mechanism so as to complete the physical attachment of the middle frame and the cover plate.
If the first displacement and the second displacement are not zero, the middle frame and the cover plate are moved simultaneously to attach the cover plate to the middle frame;
if the first displacement is not zero and the second displacement is zero, moving the middle frame to attach the cover plate to the middle frame;
and if the first displacement is zero and the second displacement is not zero, the cover plate is moved to attach the cover plate to the middle frame.
In the embodiment of the application, a first point cloud corresponding to a middle frame and a second point cloud corresponding to a cover plate are obtained at first, the virtual middle frame and the virtual cover plate are drawn, then the virtual middle frame and the virtual cover plate are assembled, a first displacement required by the virtual middle frame to move and a second displacement required by the virtual cover plate to move are obtained, and finally the actual middle frame and the actual cover plate are assembled according to the first displacement and the second displacement.
Referring to fig. 2, fig. 2 is a second flowchart illustrating a cover plate assembling method according to an embodiment of the present disclosure. The cover plate assembling method provided by the embodiment of the application comprises the following steps:
a middle frame and a cover plate are provided 201.
The middle frame can be a structural main body of the middle frame, the middle plate or a semi-finished product assembly with the middle plate of the electronic equipment and the like for bearing the overall strength of the electronic equipment and each assembly. The middle frame is generally a flat plate structure.
The cover plate can be a rear cover of the electronic device, a screen or a transparent cover plate on the screen. The cover plate can be a plane cover plate and can also be a curved surface cover plate. Wherein, curved surface apron includes 2.5D curved surface apron and 3D curved surface apron. The 2.5D curved cover plate is a curved cover plate with a plane structure at the middle part and a curved structure at the edge part, and the 3D cover plate is a curved cover plate with a curved structure at the middle part and the edge part but the curvature of the middle part is smaller than that of the edge part.
202, drawing a theoretical assembly design drawing of the middle frame and the cover plate.
The theoretical assembly design drawing of the middle frame and the cover plate is usually completed in CAD, CERO, SOLIDWORK and other software. And drawing a theoretical assembly design drawing of the middle frame and the cover plate according to the assembly parameter requirements.
After theoretical assembly drawings of the middle frame and the cover plate are drawn, the virtual middle frame and the virtual cover plate are respectively subjected to optimal surface area matching with the theoretical assembly design drawings, first relative conversion coordinates of a scanning surface of the virtual middle frame and a design surface and second relative conversion coordinates of the scanning surface of the virtual cover plate and the design surface are obtained, the first relative conversion coordinates are used as first displacement, and the second relative conversion coordinates are used as second displacement.
The matching surface for optimally matching the curved surface area of the virtual middle frame and the theoretical assembly design drawing and the curved surface area of the virtual cover plate and the theoretical assembly design drawing is generally selected as the actual matching surface of the middle frame and the cover plate, for example, a surface corresponding to the bonding surface, the fixed matching surface or the contact surface of the middle frame and the cover plate in the virtual middle frame can be selected as the matching surface for optimally matching the curved surface area of the virtual middle frame and the theoretical assembly design drawing, and a surface corresponding to the bonding surface, the fixed matching surface or the contact surface of the cover plate and the middle frame in the virtual cover plate can be selected as the matching surface for optimally matching the curved surface area of the virtual cover plate and the theoretical assembly design drawing.
And 203, establishing a workpiece coordinate system of the first point cloud, and acquiring the spatial coordinates of the first point cloud.
Generally, the centroid, centroid or characteristic shape of the point cloud is used as the spatial position coordinate (x, y, z) of the point cloud, and the specific surface, line or characteristic shape of the point cloud is used as the spatial angle coordinate (u, v, w) of the point cloud, so as to obtain the workpiece coordinate system with six degrees of freedom.
In the embodiment of the application, a centroid or a characteristic shape of the first point cloud is selected as a spatial position coordinate (x1, y1, z1) of the first point cloud, a specific surface, a specific line or a characteristic shape of the first point cloud is selected as a spatial angle coordinate (u1, v1, w1) of the first point cloud, and a spatial coordinate (x1, y1, z1, u1, v1, w1) with six degrees of freedom of the first point cloud is obtained.
And 204, aligning the virtual middle frame with the theoretical assembly design drawing to obtain the assembly coordinates of the virtual middle frame.
After the virtual middle frame is moved to be aligned with the middle frame in the theoretical assembly design drawing, the virtual middle frame is moved to the assembly position, and the coordinates (x3, y3, z3, u3, v3 and w3) of the virtual middle frame are the assembly coordinates of the virtual middle frame. When the assembly coordinate of the virtual middle frame is obtained, the position error between the gap matching surface of the virtual middle frame and the theoretical assembly design drawing can be synchronously output.
205, calculating the first relative transformation coordinate according to the assembly coordinate of the virtual middle frame and the space coordinate of the first point cloud.
According to the definition of "displacement", the first relative transformation coordinate is (x3-x1, y3-y1, z3-z1, u3-u1, v3-v1 and w3-w1), that is, the first displacement is (x3-x1, y3-y1, z3-z1, u3-u1, v3-v1 and w3-w 1).
206, establishing a workpiece coordinate system of the second point cloud, and obtaining the spatial coordinates of the second point cloud.
In the embodiment of the application, a centroid or a characteristic shape of the second point cloud is selected as a spatial position coordinate (x2, y2, z2) of the second point cloud, a specific surface, a specific line or a characteristic shape of the second point cloud is selected as a spatial angle coordinate (u2, v2, w2) of the second point cloud, and a spatial coordinate (x2, y2, z2, u2, v2, w2) with six degrees of freedom of the second point cloud is obtained.
And 207, aligning the virtual cover plate with the theoretical assembly design drawing to obtain the assembly coordinates of the virtual cover plate.
After the virtual cover plate is moved to be aligned with the cover plate in the theoretical assembly design drawing, the virtual cover plate is moved to the assembly position, and at the moment, the coordinates (x4, y4, z4, u4, v4 and w4) of the virtual cover plate are the assembly coordinates of the virtual cover plate. When the assembly coordinate of the virtual cover plate is obtained, the position error between the gap matching surface of the virtual cover plate and the theoretical assembly design drawing can be synchronously output.
208, calculating the second relative transformation coordinates according to the assembly coordinates of the virtual cover plate and the spatial coordinates of the second point cloud.
According to the definition of "displacement", the second relative transformation coordinate is (x4-x2, y4-y2, z4-z2, u4-u2, v4-v2, w4-w2), that is, the second displacement is (x4-x2, y4-y2, z4-z2, u4-u2, v4-v2, w4-w 2).
In the embodiment of the application, a first point cloud corresponding to a middle frame and a second point cloud corresponding to a cover plate are obtained at first, the virtual middle frame and the virtual cover plate are drawn, then the virtual middle frame and the virtual cover plate are assembled, a first displacement required by the virtual middle frame to move and a second displacement required by the virtual cover plate to move are obtained, and finally the actual middle frame and the actual cover plate are assembled according to the first displacement and the second displacement. Meanwhile, the cover plate assembly method provided by the embodiment of the application directly adopts the matching result between the three-dimensional surface of the virtual middle frame and the three-dimensional surface of the virtual cover plate as the assembly basis of the virtual middle frame and the virtual cover plate, so that the assembly result obtained by performing simulated assembly on the middle frame and the cover plate is closer to the actual assembly effect, and the assembly precision of the middle frame and the cover plate is higher.
Referring to fig. 3, fig. 3 is a third flowchart illustrating a cover plate assembling method according to an embodiment of the present disclosure. The cover plate assembling method provided by the embodiment of the application comprises the following steps:
301, a middle frame and a cover plate are provided.
The middle frame can be a structural main body of the middle frame, the middle plate or a semi-finished product assembly with the middle plate of the electronic equipment and the like for bearing the overall strength of the electronic equipment and each assembly. The middle frame is generally a flat plate structure.
The cover plate can be a rear cover of the electronic device, a screen or a transparent cover plate on the screen. The cover plate can be a plane cover plate and can also be a curved surface cover plate. Wherein, curved surface apron includes 2.5D curved surface apron and 3D curved surface apron. The 2.5D curved cover plate is a curved cover plate with a plane structure at the middle part and a curved structure at the edge part, and the 3D cover plate is a curved cover plate with a curved structure at the middle part and the edge part but the curvature of the middle part is smaller than that of the edge part.
302, establishing a workpiece coordinate system of the first point cloud and the second point cloud, and obtaining the spatial coordinates of the first point cloud and the second point cloud.
In the embodiment of the application, a centroid or a characteristic shape of a first point cloud is selected as a spatial position coordinate (x1, y1, z1) of the first point cloud, a specific surface, a specific line or a characteristic shape of the first point cloud is selected as a spatial angle coordinate (u1, v1, w1) of the first point cloud, and a spatial coordinate (x1, y1, z1, u1, v1, w1) with six degrees of freedom of the first point cloud is obtained; and selecting a centroid, a centroid or a characteristic shape of the second point cloud as a space position coordinate (x2, y2, z2) of the second point cloud, and selecting a specific surface, a specific line or a characteristic shape of the second point cloud as a space angle coordinate (u2, v2, w2) of the second point cloud to obtain a space coordinate (x2, y2, z2, u2, v2, w2) with six degrees of freedom of the second point cloud.
303, establishing a plurality of regions of interest on the first point cloud and the second point cloud.
In machine vision and image processing, a region to be processed is defined as a region of interest (ROI) by a square, a circle, an ellipse, an irregular polygon, or the like from an image to be processed.
After the space coordinates of the first point cloud and the second point cloud are obtained, the constraint relation between the virtual middle frame and the virtual cover plate needs to be determined.
In the embodiment of the application, the region of interest is a region for detecting/characterizing a fit gap between the middle frame and the cover plate. An interval point taking method can be adopted, and 2-10 groups of point cloud areas are selected as interested areas on each side along the edges of the virtual middle frame and the virtual cover plate.
And 304, determining the constraint surface of the virtual middle frame and the constraint surface of the virtual cover plate, and acquiring a plurality of groups of area arrays consisting of a part of the constraint surface of the virtual middle frame, which is positioned in one region of interest, and a part of the constraint surface of the virtual cover plate, which is positioned in the same region of interest.
The coplanar condition of the bonding surface, the fixed matching surface or the contact surface of the middle frame and the cover plate is generally used as the matching constraint of the middle frame and the cover plate: in the case of assembling the rear cover and the middle frame, the adhesive surface of the double-sided adhesive is selected as the constraint of the assembling relation between the rear cover and the middle frame; in the case of assembling the screen and the middle frame, the adhesive dispensing surface is selected as the constraint of the assembling relation between the screen and the middle frame.
305, establishing the constraint relationship according to at least two groups of the area arrays.
In the actual fitting relationship, at least two sets of area arrays are generally selected to establish the fitting constraint relationship between the middle frame and the cover plate. It can be understood that the more area arrays are selected, the smaller the assembly error between the middle frame and the cover plate in the actual assembly process is.
And 306, determining coherent surfaces of the virtual middle frame and the virtual cover plate at two ends of the gap between the virtual middle frame and the virtual cover plate.
After the constraint relation between the virtual middle frame and the virtual cover plate is determined, a target parameter relation for assembling the virtual middle frame and the virtual cover plate needs to be determined.
In the embodiment of the application, the coherent surface of the middle frame and the cover plate can be the surface of the middle frame opposite to the rear cover and/or the side surface of the middle frame, and the coherent surface of the cover plate and the middle frame can be the lower arc surface of the cover plate. Of course, the embodiment of the present application does not limit the selection of the coherent surface.
307, multiple sets of area arrays of the coherent plane in the multiple regions of interest are obtained, each set of area arrays having a gap width.
And 308, taking the sum of the widths of the gaps of the multiple groups of area arrays as a first target parameter, and taking the difference between the widths of the gaps of the two groups of area arrays on the two opposite edges on the coherent surface as a second target parameter, wherein one group of area arrays corresponds to one monitoring area of the gap.
309, moving the first point cloud in fixed steps according to the constraint relationship in each of the six degrees of freedom in space.
Optionally selecting one degree of freedom direction in six degrees of freedom in space, and moving the first point cloud in a fixed step length according to the constraint relation; the first point cloud … … is then moved in fixed steps in accordance with the above-described constraint relationship in the other of the six degrees of freedom in space until the above-described operation is performed in each of the six degrees of freedom in space.
And 310, outputting the first target parameter and the second target parameter after moving the first point cloud in each step, monitoring the change trend of the value of the first target parameter and the change trend of the value of the second target parameter, and acquiring two position points of convergence of the first target parameter and the second target parameter on each degree of freedom in six degrees of freedom in space.
And 311, reducing the step length of moving the first point cloud between the two position points by a dichotomy, and acquiring the first position point.
312, the first position point in six degrees of freedom of the space is collected, and the assembly movement coordinates of the virtual middle frame are obtained.
313, moving the second point cloud in fixed steps according to the constraint relationship in each of the six degrees of freedom in space.
Optionally selecting one degree of freedom direction in six degrees of freedom in space, and moving the second point cloud in a fixed step length according to the constraint relation; then, in the other direction of the six degrees of freedom in space, the second point cloud … … is moved in fixed steps according to the constraint relationship until the above operation is performed in each direction of the six degrees of freedom in space.
And 314, outputting the first target parameter and the second target parameter after moving the second point cloud in each step, monitoring the change trend of the value of the first target parameter and the change trend of the value of the second target parameter, and acquiring two position points of convergence of the first target parameter and the second target parameter on each degree of freedom in six degrees of freedom in space.
315, reducing the step length of moving the second point cloud between the two position points by dichotomy, and obtaining the second position point.
And 316, collecting the second position point in the six degrees of freedom in the space, and acquiring the assembly movement coordinate of the virtual cover plate.
In the embodiment of the application, a first point cloud corresponding to a middle frame and a second point cloud corresponding to a cover plate are obtained at first, the virtual middle frame and the virtual cover plate are drawn, then the virtual middle frame and the virtual cover plate are assembled, a first displacement required by the virtual middle frame to move and a second displacement required by the virtual cover plate to move are obtained, and finally the actual middle frame and the actual cover plate are assembled according to the first displacement and the second displacement. Meanwhile, the cover plate assembling method provided by the embodiment of the application actually uses the assembling gap between the virtual middle frame and the virtual cover plate as the assembling basis of the virtual middle frame and the virtual cover plate, so that the assembling gap for assembling the middle frame and the cover plate is more uniform and smaller, and the appearance of the assembled electronic equipment is more integrally strong.
In addition, the 3D point cloud reduction used in the embodiment of the application can greatly reduce the appearance characteristics of the characteristic parts of the middle frame and the cover plate, so that the point cloud data can be used for simulating the assembly relation, extracting relevant characteristics and calculating relevant dimensions (such as length, width, contour of arc edge, arc height, arc length and the like). During assembly, the dimensional stability of incoming materials of the middle frame and the cover plate is monitored, so that the production end of the component is guided to optimize the production process in time, and the difference between the actual dimension and the expected dimension is reduced; meanwhile, unqualified parts can be knocked out, and poor products are prevented from being produced.
The 3D point cloud virtual assembly used in the scheme is based on the uniformity and consistency of the gap, so that the actual gap size can be calculated while the simulated assembly effect is obtained. Under the condition that a bottleneck exists in the current arc edge gap measurement, the gap level of an assembled finished product can be better monitored, and meanwhile, the data can be used for guiding the design end to optimize design and dimension tolerance design, so that the overall gap effect is improved, and the risk of the gap customer in the pre-estimated market is facilitated.
The above disclosure provides many different embodiments or examples for implementing different structures of the application. The components and arrangements of specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present application.
The image display device and the wearable device provided by the embodiment of the application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method of assembling a cover plate, comprising:
providing a middle frame and a cover plate;
acquiring a first point cloud corresponding to the middle frame and a second point cloud corresponding to the cover plate, and drawing a virtual middle frame and a virtual cover plate;
assembling the virtual middle frame and the virtual cover plate based on the first point cloud and the second point cloud to obtain a first displacement between the assembling position and the original position of the virtual middle frame and a second displacement between the assembling position and the original position of the virtual cover plate;
and moving the middle frame and/or the cover plate according to the first displacement and the second displacement to joint the cover plate with the middle frame.
2. The cover assembly method of claim 1, wherein the step of assembling the virtual center and the virtual cover based on the first point cloud and the second point cloud to obtain a first displacement between an assembly position and an original position of the virtual center and a second displacement between an assembly position and an original position of the virtual cover comprises:
drawing a theoretical assembly design drawing of the middle frame and the cover plate;
carrying out optimal matching on the curved surface area of the virtual middle frame and the theoretical assembly design drawing to obtain a first relative transformation coordinate of the scanning curved surface of the virtual middle frame and the design curved surface, and taking the first relative transformation coordinate as the first displacement;
and optimally matching the curved surface area of the virtual cover plate with the theoretical assembly design drawing to obtain a second relative conversion coordinate of the scanning curved surface of the virtual cover plate and the design curved surface, wherein the second relative conversion coordinate is taken as the second displacement.
3. The cover plate assembling method according to claim 2, wherein a matching surface that best matches the virtual middle frame with the theoretical assembly design drawing in a curved surface region and best matches the virtual cover plate with the theoretical assembly design drawing in a curved surface region is an adhesive surface, a fixed mating surface or a contact surface of the virtual middle frame and the virtual cover plate;
the step of optimally matching the curved surface area of the virtual middle frame and the theoretical assembly design drawing to obtain a first relative transformation coordinate of the scanning curved surface of the virtual middle frame and the design curved surface comprises the following steps:
establishing a workpiece coordinate system of the first point cloud, and acquiring a spatial coordinate of the first point cloud;
aligning the virtual middle frame with the theoretical assembly design drawing to obtain the assembly coordinates of the virtual middle frame;
calculating the first relative transformation coordinate according to the assembly coordinate of the virtual middle frame and the space coordinate of the first point cloud;
the step of optimally matching the curved surface area of the virtual cover plate with the theoretical assembly design drawing to obtain a second relative conversion coordinate of the scanning curved surface of the virtual cover plate and the design curved surface comprises the following steps:
establishing a workpiece coordinate system of the second point cloud, and acquiring a space coordinate of the second point cloud;
aligning the virtual cover plate with the theoretical assembly design drawing to obtain the assembly coordinates of the virtual cover plate;
and calculating the second relative transformation coordinate according to the assembly coordinate of the virtual cover plate and the space coordinate of the second point cloud.
4. The cover plate assembling method according to claim 3,
the step of establishing a workpiece coordinate system of the first point cloud and obtaining the spatial coordinates of the first point cloud comprises the following steps:
selecting a mass center, a centroid or a characteristic shape of the first point cloud as a spatial position coordinate of the first point cloud, selecting a specific surface, a specific line or a characteristic shape of the first point cloud as a spatial angle coordinate of the first point cloud, and calculating the spatial coordinate of the first point cloud;
the step of establishing a workpiece coordinate system of the second point cloud and obtaining the spatial coordinates of the second point cloud comprises the following steps:
and selecting the mass center, the centroid or the characteristic shape of the second point cloud as the space position coordinate of the second point cloud, selecting a specific surface, a specific line or the characteristic shape of the second point cloud as the space angle coordinate of the second point cloud, and calculating the space coordinate of the second point cloud.
5. The cover assembly method of claim 1, wherein the step of assembling the virtual center and the virtual cover based on the first point cloud and the second point cloud to obtain a first displacement between an assembly position and an original position of the virtual center and a second displacement between an assembly position and an original position of the virtual cover comprises:
establishing a workpiece coordinate system of the first point cloud and the second point cloud, and acquiring space coordinates of the first point cloud and the second point cloud;
determining a constraint relation between the virtual middle frame and the virtual cover plate;
determining a target parameter relation for assembling the virtual middle frame and the virtual cover plate;
moving the first point cloud and the second point cloud in a fixed step length according to the constraint relation in each degree of freedom direction in six degrees of freedom in space to obtain a first position point of the first point cloud and a second position point of the second point cloud which meet the precision requirement in each degree of freedom direction in six degrees of freedom in space;
collecting the first position points in six degrees of freedom of a space, and acquiring the assembly moving coordinate of the virtual middle frame;
and collecting the second position point in six degrees of freedom in the space to obtain the assembly moving coordinate of the virtual cover plate.
6. The cover assembly method of claim 5, wherein the step of determining the constrained relationship of the virtual middle frame to the virtual cover includes:
establishing a plurality of regions of interest on the first point cloud and the second point cloud;
determining a constraint surface of the virtual middle frame and a constraint surface of the virtual cover plate, and acquiring a plurality of groups of area arrays formed by a part of the constraint surface of the virtual middle frame, which is positioned in one region of interest, and a part of the constraint surface of the virtual cover plate, which is positioned in the same region of interest;
and establishing the constraint relation according to at least two groups of area arrays.
7. The cover plate assembling method according to claim 5, wherein the target parameter is a relative gap between the virtual middle frame and the virtual cover plate, and the step of determining a target parameter relationship for assembling the virtual middle frame and the virtual cover plate includes:
determining coherent surfaces of the virtual middle frame and the virtual cover plate at two ends of a gap between the virtual middle frame and the virtual cover plate;
establishing a plurality of interest areas on the first point cloud and the second point cloud, and acquiring a plurality of groups of area arrays of which the coherent surfaces are located in the plurality of interest areas, wherein each group of area arrays has a gap width;
and taking the sum of the gap widths of a plurality of groups of area arrays as a first target parameter, and taking the difference of the gap widths of two groups of area arrays positioned on two opposite edges on the coherent surface as a second target parameter, wherein one group of area arrays corresponds to one monitoring area of the gap.
8. The cover plate assembling method according to claim 7, wherein the step of moving the first point cloud and the second point cloud in fixed steps according to the constraint relationship in each of six degrees of freedom in space to obtain a first position point of the first point cloud and a second position point of the second point cloud satisfying the accuracy requirement in each of six degrees of freedom in space comprises:
moving the first point cloud in a fixed step according to the constraint relationship in each degree of freedom of six degrees of freedom in space;
outputting the first target parameter and the second target parameter after moving the first point cloud in each step, monitoring the change trend of the value of the first target parameter and the change trend of the value of the second target parameter, and acquiring two position points of convergence of the first target parameter and the second target parameter on each degree of freedom in six degrees of freedom in space;
reducing the step length of moving the first point cloud between the two position points by a dichotomy to obtain the first position point;
moving the second point cloud in a fixed step length according to the constraint relation in each degree of freedom direction in six degrees of freedom in space;
outputting the first target parameter and the second target parameter after moving the second point cloud in each step, monitoring the change trend of the value of the first target parameter and the change trend of the value of the second target parameter, and acquiring two position points of convergence of the first target parameter and the second target parameter on each degree of freedom in six degrees of freedom in space;
and reducing the step length of moving the second point cloud between the two position points by a dichotomy to obtain the second position point.
9. The cover assembly method according to any one of claims 1 to 8, wherein the cover is a screen and/or a rear cover of an electronic device.
10. An electronic device comprising a center frame and a cover plate, wherein the cover plate is assembled to the center frame using the cover plate assembling method according to any one of claims 1 to 9.
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